I start a new job tomorrow but have been diagnosed with a infection/illness whag do I do?

I’ve not been myself the past week so went to the doctor and they said I have to take these anti biotics to feel better and will feel better in a week or two. Although I was meant to start my job tomorrow. What do I do? The anti biotics make me feel so sick and she told me that I should rest. I’m scared to tell the job incase they just think there’s no point since I’m ill.
I start a new job tomorrow but have been diagnosed with a infection/illness whag do I do?
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